Space Storms Affect Life on Earth
Studies of how the Earth's environment interacts with space and the solar
wind are far more than an academic exercise. They are important in shaping
the environment we enjoy today - and whether we enjoy it in the dark.
The solar wind and space plasma storms induce
massive electrical currents
that can affect power systems on the ground,
especially in the north. A
large storm in 1989 induced currents in the
American northeast that caused
a failure in the Hydro-Quebec power
system that deprived 6 million people
of power for over 9 hours in
Canada and the United States. The same storm
expanded the upper
atmosphere and increased drag on NASA's Long Duration
Exposure Facility (LDEF) satellite which carried valuable specimens
of materials
in space exposure tests (NASA recovered LDEF before
it could re-enter the
atmosphere).
Similar storms
can set up currents that corrode the metal structure of petroleum
pipelines, disrupt satellite and land-based communications, s
hort-circuit
satellite electronics, and interfere with
navigational systems on ships
and aircraft.
We cannot stop geomagnetic storms, but we can understand them and,
eventually,
predict what their effects may be in time to take
measures to protect valuable
power grids, satellites, aircraft,
and other systems. Instruments like Polar's
Thermal Ion Dynamics
Experiment and Plasma Source Instrument will help provide
that
knowledge.
P>
November 20, 1996
Authors:
Dave Dooling,
B.L.
Giles
Curator: Linda Porter
NASA Official: Gregory
S.
Wilson